JPH0455053B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a coffee brewer.

BACKGROUND ART Conventionally, there has been known a coffee boiler in which a mill mechanism for grinding coffee beans and a dripping mechanism are integrated, and the operation is automatically switched to the dripping operation after grinding the coffee beans.

That is, as shown in FIGS. 3 and 4, the coffee boiler includes a container 1 that integrates a coffee bean grinding chamber and a filtration chamber that extracts coffee liquid and separates the extracted liquid and residue. The container 1 is equipped with a cutter 3 that is rotationally driven by a motor 2, and is equipped with a filter 4 at the bottom that separates the extract from the residue. and includes a timer 7 that automatically switches from energizing the motor 2 to energizing the heater 6 after the motor 2 has finished operating.
It is equipped with a switch 8 that starts energizing.

In the above configuration, when the timer 7 is set to the "mill" position and power is started by the switch 8, the coffee beans are ground by the cutter 3, and then the drip function is automatically performed.
That is, the water contained in the tank 9 flows through the check valve 10.
The hot water is introduced into a water pipe 11 formed integrally with the heater 6 through the heater 6, and is pushed up by the steam pressure generated when the water is heated by the heater 6, and is positioned above the container 1. Discharge pipe 1
1', and from this discharge pipe 11', the container 1
Hot water is poured inside to extract the coffee liquid,
Coffee liquid is contained in a glass container 12.

Furthermore, when the timer 7 is set to the "drip" position and the switch 8 is operated, only the above-described drip function is performed.

Figure 5 shows the specific circuit diagram.
13 is a thermostat, and this thermostat 1
3 is a device that turns ON/OFF based on the operating temperature of the device itself (hereinafter referred to as “adjustment temperature”) and the temperature that it itself receives (hereinafter referred to as “measurement temperature”).In other words, if the measured temperature is lower than the adjustment temperature, If the temperature is high, the heater 6 is turned on, and if the temperature is high, the heater 6 is turned on.
It is something that should be turned off.

It should be noted that the area inside the frame is a circuit diagram during drip operation.

Problems to be Solved by the Invention When making a large amount of coffee continuously, once the dripping is finished, the extracted coffee liquid is transferred to another container, and then the same procedure is repeated with fresh coffee beans and water. However, when we investigate the actual usage in this case, we often forget to fill the tank 9 with water when repeating such operations.

In order to perform the drip operation in such a state, when the timer 7 is set to the "drip" position and the switch 8 is operated, the heater 6 is energized and heated, resulting in a so-called dry firing state. As a result, various parts within the main body are heated abnormally and their shapes are deformed, which is a major cause of failure. In other words, the temperature change of the water in the tank 9 during the drip operation is as shown in FIG. It is heated and the temperature gradually rises (heating). When the boiling temperature is reached, steam is generated, and the steam pressure pushes up the hot water and guides it to the discharge pipe 11', where coffee is extracted. Discharge pipe 1
While coffee continues to be extracted by supplying hot water from 1', the temperature is maintained at approximately boiling temperature.

Then, when the supply of hot water from the discharge pipe 11' is almost completed and the hot water is in a dripping state, the temperature rises again due to heating from the heater 6, and when a predetermined temperature is reached, the heater is turned off (extraction).

In other words, when the dripping operation is finished, the temperature is above the boiling temperature, and if you forget to add water to the tank 9 and repeat the dripping operation, the heater 6 will be energized and the temperature will become dry. However, when such dry firing is performed, there are problems in that it not only wastes power, but also causes significant deterioration of each component, leading to failure.

The object of the present invention is to provide a coffee boiler that solves these problems.

Means for Solving the Problems In order to solve the above problems, the coffee boiler of the present invention includes a tank provided in the main body and containing water, a water pipe for guiding the water in the tank, and a water pipe for directing the water. A heater for heating, a temperature sensing element for detecting the temperature in the vicinity of the heater, a heater energization control means for controlling energization of the heater, a drip mechanism for supplying hot water to coffee powder to extract coffee liquid, and a drip mechanism for extracting coffee liquid by supplying hot water to coffee grounds; A drip start temperature setting means for setting the temperature at which electricity is applied to the drip, a time measuring means for measuring the time from the start of dripping, and a drip start possible time setting means for setting the limit value of the time measured by the time measuring means. inputting each output signal of the temperature sensing element, the drip start temperature setting means, the time measurement means, and the drip start possible time setting means to the heater energization control means or the heater energization signal based on these information. and comparison means for outputting a prohibition signal.

Effect According to the above configuration, when the drip starts, if the temperature detected by the temperature sensing element is higher than the temperature set by the drip start temperature setting means (this is taken as the predetermined temperature in FIG. 6), the heater is Since no current is applied, it is possible to prevent dry firing during repeated use.

Also, even if the temperature is high at the start of dripping,
If the detected temperature falls within the time set by the drip start possible time setting means, the heater is energized and a drip operation can be performed.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the block diagram shown in FIG.

In FIG. 1, parts that perform the same operations as in FIGS. 3 to 5 are given the same numbers, and their explanations will be omitted here.

In FIG. 1, numeral 14 is a temperature sensing element for detecting the temperature in the vicinity of the heater 6, and is installed at the position shown in FIG. 15 is a heater energization control means for controlling the energization of the heater 6; 16 is a drip start temperature setting means for setting the temperature at the start of drip; 17 is a time measurement means for measuring the time from the start of drip; 18 is the time measurement device. The drip start possible time setting means sets the set value of the time measured by the means 17, and these three outputs and the output of the temperature sensing element 14 are both input to the comparison means 19, and are determined by the comparison means 19. A signal indicating whether or not to energize the heater 6 is input to the heater energization control means 15. 20 is a notification device such as a buzzer or a lamp. The operations of the drip start temperature setting means 16, the drip start possible time setting means 18, the time measurement means 17, and the comparison means 19 in the above embodiment are programmed by the microprocessor 21.

FIG. 2 shows an overview of the processing.

In the above configuration, the timer 7 is set to "drip".
When the drip operation is started by setting the drip to the position shown in FIG. Compare to see if it's higher. As a result, if the detected temperature is lower than the set temperature, energization to the heater 6 is started, but in the opposite case, the timer, which is the time measuring means 17, is operated. Then, if it is within the time set by the drip start possible time setting means 18 (hereinafter referred to as "set time"), the temperature sensing element 14
Repeat temperature detection. If the detected temperature becomes lower than the set temperature within the set time, the drip operation will start, but if the detected temperature is still higher than the set temperature even after the set time has passed, the alarm will
0 is driven to notify an abnormality. That is, in this embodiment, if the temperature detected by the temperature sensing element 14 is equal to or higher than the set temperature at the start of dripping, the heater 6 is not energized, and even if the detected temperature is equal to or higher than the set temperature even after the set time has elapsed, the heater 6 is not energized. The structure is such that an abnormality notification is performed. Conversely, if the detected temperature falls below the set temperature (waiting for cooling) within the set time, the heater 6 is energized.

The drip operation may be started at the above-mentioned "drip" position and only the drip operation is performed, or the drip operation may be performed after the mill operation is completed. Further, in the above embodiment, a coffee boiler equipped with a mill mechanism has been described, but it goes without saying that the present invention can also be applied to a coffee boiler without a mill mechanism.

Effects of the Invention As described above, according to the present invention, if the temperature detected by the temperature sensing element is higher than the temperature set by the drip start temperature setting means at the time of starting dripping, the heater is not energized. Therefore, it is possible to prevent dry firing during repeated use, thereby eliminating unnecessary power consumption due to dry heating, and also preventing failures due to abnormal heating of each component.
Further, even if the temperature is high at the time of starting dripping, if the detected temperature falls within the time set by the drip start time setting means, the heater is energized and the dripping operation can be performed. It is something.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a coffee boiler showing an embodiment of the present invention, Fig. 2 is a flowchart for explaining the operation of the coffee boiler, and Fig. 3 is a front view of a conventional coffee boiler. Fig. 4 is a longitudinal sectional view of the same coffee boiler, Fig. 5 is a circuit diagram of the same coffee boiler,
FIG. 6 is a temperature characteristic curve diagram during heating. 5...Body, 6...Heater, 9...Tank, 1
DESCRIPTION OF SYMBOLS 1... Water pipe, 14... Temperature sensing element, 15... Heater energization control means, 16... Drip start temperature setting means, 17... Time measuring means, 18... Drip start possible time setting means, 19... Comparison Means, 20...
...Alarm, 21...Microprocessor.

Claims (1)

[Claims] 1. A tank provided in the main body and containing water, a water pipe guiding the water in the tank, a heater that heats the water, and a temperature sensing element that detects the temperature near the heater. , a heater energization control means for controlling energization of the heater, a drip mechanism for supplying hot water to coffee grounds and extracting coffee liquid, a drip start temperature setting means for setting a temperature at which the heater is energized, and a drip start temperature setting means for setting the temperature at which the heater is energized; a time measuring means for measuring the time from the hour; a drip start possible time setting means for setting a limit value of the time measured by the time measuring means; the temperature sensing element, the drip start temperature setting means, the time measuring means; Each output signal of the drip start possible time setting means is inputted, and the elapsed time from the drip start is within the time preset in the drip start possible time setting means, and the temperature detected by the temperature sensing element is the drip start time. If the temperature is lower than the temperature preset in the temperature setting means,
A coffee brewer comprising: a comparison means for outputting a heater energization signal to the heater energization control means; and, if not, a comparison means for outputting a heater energization prohibition signal. 2. The coffee brewer according to claim 1, wherein an alarm is activated when the heater is not energized even after the time set by the drip start time setting means.